I am curious. Is that allowed as part of ARM's licensing? It would be surprising that ARM is okay with that, unless Apple bullied them into allowing them to call and market it as Apple silicon.
Qualcomm calls their ARM chips Snapdragon. Samsung calls their's Exynos. Mediatek calls their's Dimensity.
ARM doesn't care what you call them.
And since everyone calls them something other than ARM, there's not much brand value in calling something "ARM". Might as well call it "Apple silicon".
That's a good point. Sort of interesting.
Apple co-founded ARM, so they almost certainly have a custom deal/licensing terms.